20
15 19 13 12 17 11 20 18 16 14 
16 17 14 12 15 18 20 11 13 19 
18 20 12 16 19 17 14 11 13 15 
11 12 19 15 14 13 17 18 20 16 
13 11 18 15 17 19 14 12 16 20 
15 14 19 11 17 12 20 13 18 16 
16 20 17 19 14 18 15 12 13 11 
12 14 19 15 13 17 11 18 20 16 
16 11 13 20 12 19 18 14 15 17 
13 19 18 16 15 20 14 12 11 17 
3 10 2 7 1 5 8 9 4 6 
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10 9 2 3 1 7 5 8 6 4 
3 9 10 1 7 6 4 2 5 8 
7 4 5 9 3 6 8 1 10 2 
2 7 3 5 6 1 4 10 8 9 
1 9 7 8 6 5 3 4 2 10 
7 2 10 4 5 9 6 8 1 3 
8 4 9 1 6 2 5 3 7 10 
9 5 8 2 3 6 4 10 7 1 
forbidden 1 11
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forbidden 10 19